Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+

2007 ◽  
Vol 22 (1) ◽  
pp. 206-216 ◽  
Author(s):  
Y.N. Wu ◽  
A. Yamaguchi ◽  
H. Murakami ◽  
S. Kuroda
Keyword(s):  
Single Crystal ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Aluminide Coating ◽  
Mass Gain ◽  
Heating Time ◽  
Single Crystal Superalloy ◽  
Aluminide Coatings ◽  
Corrosion Kinetics ◽  
Nickel Base

Platinum-iridium films (Ir = 0, 32, 46, 83, 100 at.%) were deposited on the nickel-base single crystal superalloy through magnetron sputtering. After annealing and aluminizing, the Pt-Ir modified aluminide coatings mainly consisted of PtAl2 and β-(Ni,Pt,Ir)Al phases. Hot corrosion resistance of Pt-Ir modified aluminide coatings with the different Ir contents were evaluated by exposure at 1173 K in the presence of the 90%Na2SO4 + 10%NaCl (wt%) salt deposits. The corrosion kinetics curves of the specimens were plotted up to 100 h heating time. The phase constitution, morphology of corrosion products, and element concentrations along the cross section were also measured. The lowest mass gain (0.299 mg/cm2, after 100 h) was observed for Pt-46Ir aluminide coating because the dense and continuous protective Al2O3 scale formed. Phase transformation from β-(Ni,Pt)Al to γ′-(Ni,Pt)3Al, characteristics of the scale, and protection by Pt/Ir enriched layer had the important effects on the hot corrosion behavior of modified aluminide coatings.

Effect of Pt-rich position on the hot corrosion behavior of NiCoCrAlY coating for a single-crystal superalloy

2020 ◽  
Vol 395 ◽  
pp. 125938 ◽  
Author(s):  
Y.F. Yang ◽  
P. Ren ◽  
Z.B. Bao ◽  
S.L. Zhu ◽  
F.H. Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Single Crystal Superalloy

scholarly journals Study on abnormal hot corrosion behavior of nickel-based single-crystal superalloy at 900 °C after drilling

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Zehao Chen ◽  
Mengmeng Wu ◽  
Yanling Pei ◽  
Shusuo Li ◽  
Shengkai Gong
Keyword(s):  
Diffusion Process ◽  
Single Crystal ◽  
Oxide Layer ◽  
Corrosion Behavior ◽  
Surface Stress ◽  
Hot Corrosion ◽  
Single Crystal Superalloy ◽  
Alloying Elements ◽  
Stable Oxide ◽  
Change Of Microstructure

AbstractThe hot corrosion behavior of nickel-based single-crystal superalloy after drilling is investigated at 900 °C. The characteristics of hot corrosion after drilling which are different from normal hot corrosion are reflected in the formation of a more stable oxide layer and less severe spallation. The change of microstructure around the hole is the main reason for the formation of a stable oxide layer during hot corrosion by changing the diffusion process of alloying elements. Subsequently, the formation of a stable oxide layer can reduce the effect of spalling by optimizing surface stress.

scholarly journals Hot Corrosion Resistance of Chromium Modified Platinum-Aluminide Coating

1986 ◽  
Author(s):  
M. W. Dust ◽  
P. Deb ◽  
D. H. Boone ◽  
S. Shankar
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Surface Composition ◽  
Aluminide Coating ◽  
Nickel Base Superalloy ◽  
Phase Layer ◽  
Aluminide Coatings ◽  
Platinum Aluminide ◽  
Nickel Base ◽  
High Level

The addition of elements such as Cr or Pt to the diffusion aluminide coatings has been reported to provide increased protectivity under hot corrosion and oxidation environments. Although the structure and corresponding corrosion resistance of Cr or Pt modified aluminides are reasonably understood there is, however, little information available on the combined additions of Cr and Pt or the processing sequences involved. The effects of both Cr and Pt additions to aluminide coatings on the IN-100 nickel-base superalloy substrate under low temperature (700°C) hot corrosion conditions have been studied. In this investigation, it was found that the structure of the Cr modified platinum-aluminide coatings is most dependent on the sequence of modifying element addition which affects the surface composition and resulting LTHC resistance. The optimum Cr-Pt coating is obtained by the Cr-Pt-Al deposition sequence which results in a continuous single PtAl2 phase layer backed up with a high level of Cr at the surface.

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